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AT89C5131A-RDTUL датащи(PDF) 40 Page - ATMEL Corporation

номер детали AT89C5131A-RDTUL
подробное описание детали  8-bit Flash Microcontroller with Full Speed USB Device
PDF  186 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C5131A-RDTUL датащи(HTML) 40 Page - ATMEL Corporation

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40
AT89C5131A-L
4338F–USB–08/07
Table 41. Program Lock Bits of the SSB
Notes:
1. U: unprogrammed or "one" level.
2. P: programmed or “zero” level.
3. WARNING: Security level 2 and 3 should only be programmed after Flash and code
verification.
Flash Memory Status
AT89C5131A-L parts are delivered with the ISP boot in the Flash memory. After ISP or
parallel programming, the possible contents of the Flash memory are summarized in
Figure 21:
Figure 21. Flash Memory Possible Contents
Memory Organization
In the AT89C5131A-L, the lowest 32K of the 64 Kbyte program memory address space
is filled by internal Flash.
When the EA is pin high, the processor fetches instructions from internal program Flash.
Bus expansion for accessing program memory from 32K upward is automatic since
external instruction fetches occur automatically when the program counter exceeds
7FFFh (32K). If the EA pin is tied low, all program memory fetches are from external
memory. If all storage is on chip, then byte location 7FFFh (32K) should be left vacant to
prevent and undesired pre-fetch from external program memory address 8000h (32K).
Program Lock Bits
Protection Description
Security
Level
LB0
LB1
1
U
U
No program lock features enabled.
2
P
U
ISP programming of the Flash is disabled.
3
P
P
Same as 2, also verify through ISP programming interface is disabled.
0000h
Virgin
Default
Virgin
After ISP
After parallel
programming
After parallel
programming
After parallel
programming
Application
Application
After ISP
or
Dedicated
ISP
Dedicated
ISP
7FFFh AT89C5131A-M
Application
Virgin
or
Application
Virgin
or
Application



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